Use Swift 5.1 in Travis CI

Author: dduan

.travis.yml

@@ -5,7 +5,7 @@ matrix:
   include:
   - os: osx
     language: objective-c
-    osx_image: xcode10.2
+    osx_image: xcode11.2
     script:
     - swift test
   - os: linux
@@ -15,9 +15,9 @@ matrix:
     env:
     before_install:
     - wget -q -O - https://swift.org/keys/all-keys.asc | gpg --import -
-    - wget https://swift.org/builds/swift-5.0-release/ubuntu1404/swift-5.0-RELEASE/swift-5.0-RELEASE-ubuntu14.04.tar.gz
-    - tar xzf swift-5.0-RELEASE-ubuntu14.04.tar.gz
-    - export PATH=${PWD}/swift-5.0-RELEASE-ubuntu14.04/usr/bin:"${PATH}"
+    - wget https://swift.org/builds/swift-5.1-release/ubuntu1404/swift-5.1-RELEASE/swift-5.1-RELEASE-ubuntu14.04.tar.gz
+    - tar xzf swift-5.1-RELEASE-ubuntu14.04.tar.gz
+    - export PATH=${PWD}/swift-5.1-RELEASE-ubuntu14.04/usr/bin:"${PATH}"
     script:
     - swift test
 notifications: